.background {
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center center;
  overflow: hidden;
  will-change: transform;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  height: 130vh;
  position: fixed;
  width: 100%;
  -webkit-transform: translateY(30vh);
  transform: translateY(30vh);
  -webkit-transition: all 1.2s cubic-bezier(0.22, 0.44, 0, 1);
  transition: all 1.2s cubic-bezier(0.22, 0.44, 0, 1);
}
.background:before {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.3);
}
.background:first-child {
  background-image: url(../img/bg02.jpg);
  -webkit-transform: translateY(-15vh);
          transform: translateY(-15vh);
}
.background:first-child .content-wrapper {
  -webkit-transform: translateY(15vh);
          transform: translateY(15vh);
}
.background:nth-child(2) {
  background-image: url(../img/bg02.jpg);
}
.background:nth-child(3) {
  background-image: url(../img/bg02.jpg);
}


/* Set stacking context of slides */
.background:nth-child(1) {
  z-index: 3;
}

.background:nth-child(2) {
  z-index: 2;
}

.background:nth-child(3) {
  z-index: 1;
}